Bulk autopep8 (modules)

As agreed in 2017-12-07 Core meeting bulk fix pep8 issues

Generated using:
autopep8 1.3.3 (pycodestyle: 2.3.1)
autopep8 -r  --max-line-length 160 --in-place --ignore E305,E402,E722,E741 lib/ansible/modules

Manually fix issues that autopep8 has introduced

lib/ansible/modules/system/cron.py

@@ -217,6 +217,7 @@ class CronTab(object):
         user      - the user of the crontab (defaults to root)
         cron_file - a cron file under /etc/cron.d, or an absolute path
     """
+
     def __init__(self, module, user=None, cron_file=None):
         self.module = module
         self.user = user